package cn.rocky.offer;

public class offer67 {

    public static int strToInt(String str) {
        int res = 0,bndry = Integer.MAX_VALUE / 10;
        int i = 0, sign = 1,length = str.length();
        if (length == 0) {
            return 0;
        }
        while (str.charAt(i) == ' ') {
            if (++i == length) {
                return 0;
            }
        }
        if (str.charAt(i) == '-') {
            sign = -1;
        }
        if (str.charAt(i) == '-'|| str.charAt(i) == '+') {
            i++;
        }
        for (int j = i;j < length; j++) {
            if (str.charAt(j) < '0' || str.charAt(j) > '9') {
                break;
            }
            if (res > bndry || res == bndry && str.charAt(j) > '7') {
                return sign == 1 ? Integer.MAX_VALUE : Integer.MIN_VALUE;
            }
            res = res * 10 + (str.charAt(j) - '0');
        }
        return sign * res;
    }
    public static void main(String[] args) {
//        String str = "-0998";
        String str = "   998";
        int i = offer67.strToInt(str);
        System.out.println(i);
    }
}
